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Selected Topics in Quantum Electronics, IEEE Journal of

Issue 1 • Date Feb. 1997

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Displaying Results 1 - 17 of 17
  • Highly efficient diode-pumped 3-/spl mu/m Er/sup 3+/:BaY/sub 2/F/sub 8/ laser

    Publication Year: 1997 , Page(s): 90 - 94
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (125 KB)  

    A systematic investigation on a series of monoclinic Er3+:BaY2F8 crystals with different dopant concentrations (CEr = 5%–30%) and crystal orientations was conducted to optimize the laser performance in this new 3-μm laser medium by laser diode pumping. The highest slope efficiency of 32% near the quantum defect (35%) was obtained with a 10% doped Er3+:BaY2F8 crystal with the orientation (010) and a length of 3.5 mm. A maximum output power of 160 mW was achieved at an absorbed pump power of 550 mW at a wavelength of 970 nm. View full abstract»

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  • Diode-pumped grazing incidence slab lasers

    Publication Year: 1997 , Page(s): 3 - 8
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (116 KB)  

    Diode-pumped grazing incidence slab (GISL) lasers, and materials which may be used with this configuration, are discussed. Of the materials investigated so far, Nd:YVO4 has been shown to yield high efficiency and high small-signal gain, and a compact, 1-kHz repetition rate laser, using a Nd:YVO4 slab has generated 3-ns duration, millijoule pulses with high beam quality. A numerical model for GISL lasers has been developed and used to simulate a hybrid Nd:YVO4/Nd:YAG oscillator. A preliminary, experimental investigation of such a hybrid system has yielded results that are consistent with the model predictions View full abstract»

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  • Single-frequency Q-switched Cr,Nd:YAG laser operating at 946-nm wavelength

    Publication Year: 1997 , Page(s): 26 - 28
    Cited by:  Papers (12)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (64 KB)  

    Single-frequency Q-switched operation in 946-nm wavelength has been demonstrated by application of a monolithic Cr,Nd:YAG cavity. In this device, the Cr,Nd:YAG laser material performs the functions of light modulation, frequency stabilization, and polarization selection. The conditions for the single-frequency operation and maximum degree of polarization are discussed View full abstract»

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  • High-power diode-laser-pumped CW solid-state lasers using stable-unstable resonators

    Publication Year: 1997 , Page(s): 19 - 25
    Cited by:  Papers (10)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (140 KB)  

    We present a novel design for an efficient, high power (>100 W), continuous-wave (CW) Nd:YAG laser with diffraction-limited performance. It uses side-pumped, sidecooled, zigzag slab which is incorporated in a stable-unstable resonator that has a variable reflectivity output coupler. A geometric magnification of at least 1.3 in the unstable direction can be achieved. Modeled performance characteristics are presented View full abstract»

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  • Analytical and experimental studies on the characteristics of composite solid-state laser rods in diode-end-pumped geometry

    Publication Year: 1997 , Page(s): 9 - 18
    Cited by:  Papers (49)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (188 KB)  

    In this paper, we report analytical and experimental studies on the characteristics of end-pumped composite laser rods with undoped end, using mainly Nd:YAG rods as an example. It is found that the peak temperature rise in a composite rod decreases to <70% of that in a noncomposite crystal. Thermal stress is dramatically reduced to <60% by employing the composite rod structure, We also demonstrate high-power operation of the diode-end-pumped composite Nd:YVO4 rod and a maximum CW output power of 9.3 W was achieved, which is about 1.5 times higher than that in the noncomposite rod. This high-power performance of the composite rod is primarily attributed to the reduction of thermal stress inside the rod View full abstract»

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  • Influence of thermal effect on output power optimization in fiber-coupled laser-diode end-pumped lasers

    Publication Year: 1997 , Page(s): 29 - 34
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (184 KB)  

    A general model has been developed for the output power optimization of fiber-coupled laser-diode end-pumped lasers by including the thermal effect into the analysis. The optical path difference (OPD). Distribution has been derived as a function of the pump-beam quality, focus position of pumping light, and pump radius at the focal plane under the assumption that the end faces of the crystal are thermally insulated. With the derived OPD, the diffraction losses arising from thermal-induced spherical aberration have been estimated by the Strehl intensity ratio. The practical example of an Nd:YVO4 laser pumped by a 1.2-W fiber-coupled laser diode is considered to illustrate the utility of the present model. Experimental results have shown a fairly good agreement with the theoretical predictions View full abstract»

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  • Diode arrays, crystals, and thermal management for solid-state lasers

    Publication Year: 1997 , Page(s): 71 - 81
    Cited by:  Papers (11)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (260 KB)  

    We summarize our efforts in the development of solid-state lasers, including the laser diode arrays, pump light delivery, approaches to thermal management, and novel gain media. Our interests are in developing unique solid-state lasers, including those operating at higher powers, offering less common wavelengths, and having other specialized features. In this paper, we discuss high-power Tm:YAG and Yb:YAG lasers. The gas cooled slab laser concept using Yb:S-FAP, and side-pumped Er:YAG and Cr:ZnSe lasers. We address the optical and thermal physics of these systems and also mention several additional gain media that have the potential of offering unique performance characteristics: Ce:LiSAF, APG-2 laser glass, Dy:LaCl3, and Yb:BCBF View full abstract»

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  • Compact geometry for diode-pumped Cr:LiSAF femtosecond laser

    Publication Year: 1997 , Page(s): 95 - 99
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (96 KB)  

    A novel geometry for dispersion compensation in femtosecond lasers without specific cut of optical parts in a flat/Brewster angle or Gires-Tournots mirrors is demonstrated for attaining a compact diode-pumped Cr:LiSAF femtosecond pulse laser. In this geometry, the laser medium lies between the dispersion-compensation prism pair. This approach enables the laser to operate at variable repetition rates from 163 to 235 MHz keeping the pulsewidth less than 90 fs, where the value of the time-bandwidth product are not larger than 0.34. An 89 fs pulse duration generated at the 235 MHz repetition rate is, to our knowledge, the shortest pulse achieved in an all-solid-state Kerr-lens mode-locked laser operating above the 200 MHz repetition rate View full abstract»

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  • CW solid-state ultraviolet laser for optical disk mastering application

    Publication Year: 1997 , Page(s): 35 - 39
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (80 KB)  

    We have built a prototype laser head that emits 355-nm ultraviolet light in CW mode. The system is based on nonlinear sum-frequency mixing using a β-BaB2O4 (BBO) crystal in an external resonator in which two input emissions at 1064 and 532 nm are resonantly enhanced simultaneously. The output exhibits promising characteristics as the master recording laser source, in terms of beam shape and intensity stability. The result of reliability testing of the system in 1000-h real-time operation is also discussed View full abstract»

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  • Diode-pumped neodymium lasers repetitively Q-switched by Cr4+ :YAG solid-state saturable absorbers

    Publication Year: 1997 , Page(s): 45 - 52
    Cited by:  Papers (25)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (216 KB)  

    We report on the experimental results of a continuously diode-laser pumped Nd:YAG laser, operating at 1064 nm and repetitively Q-switched by a Cr4+:YAG solid-state saturable absorber. End-pumping the Nd:YAG with a 10-W fiber-coupled diode-laser we could either optimize the energy or the average output power, depending on the choice of the saturable absorber and the output coupler. The maximum energy was ≈200 μJ in single TEM00, 17 ns pulses at 6 kHz, whereas a maximum average power of ≈2 W with 32-ns pulses at 20 kHz was obtained. We also present preliminary results of a repetitively Q-switched Nd:YVO4 laser at 1064 nm. The repetitive Q-switching operation is described by an improved model, which accounts for the behavior of both the active medium and the solid-state saturable absorber. The results of the model agree fairly well with the experimental data. Experimental results of second harmonic conversion are also reported and interpreted using a depleted pump model View full abstract»

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  • Diode-pumped tunable Yb:YAG miniature lasers at room temperature: modeling and experiment

    Publication Year: 1997 , Page(s): 100 - 104
    Cited by:  Papers (32)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (124 KB)  

    We present a simple design rule for diode-laser pumped quasi-three-level lasers by using the M2 factor. The validity of this model was demonstrated by diode-pumped Yb:YAG laser experiments. The maximum output power of 1.33 W and optical slope efficiency of 63% were obtained in a 400-μm Yb:YAG chip miniature laser. Using a 200-μm Yb:YAG chip, a 70% optical slope efficiency was reached. In a coupled-cavity configuration, with a quartz birefringent tuning filter, 8.2 THz (29 nm) of tuning was obtained at room temperature. By changing to a calcite birefringent filter, single-axial-mode oscillation with an output power of 500 mW was observed View full abstract»

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  • Active tracker laser (ATLAS)

    Publication Year: 1997 , Page(s): 64 - 70
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (204 KB)  

    A high brightness diode-pumped, Nd-YAG solid state laser has been designed, fabricated, and tested. This phase conjugated master oscillator/power amplifier (MOPA) device produces 20-ns Q-switched pulses at 2500 Hz at an average power of 690 W and a beam quality of 1.1×DL when the pump diodes are operated at 27.5% duty cycle. With an external KTP doubler, this device has produced 175 W of green average power at a beam quality of 1.5 × DL and a conversion efficiency of 45% over continuous operating times as long as one hour. This 1.06 μm result is believed to be the highest average power brightness achieved, and the 532-nm performance is both the highest average green power and the highest average brightness ever reported View full abstract»

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  • Low threshold laser-diode side-pumped Tm:YAG and Tm:Ho:YAG lasers

    Publication Year: 1997 , Page(s): 82 - 89
    Cited by:  Papers (8)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (172 KB)  

    We report results from transverse laser-diode pumping of Tm:YAG and Tm:Ho:YAG rods. Using two 60-W quasicontinuous-wave laser-diode bars and a special dielectric coating structure on the barrel surface of the laser rod, laser operation was obtained at room temperature with threshold pump energies below 100 mJ and with output pulse energy above 10 mJ in free-running operation and 2 mJ in Q-switched operation. The Tm:Ho:YAG laser was more susceptible to a temperature increase in the material and performed significantly poorer in the Q-switched mode of operation than the Tm:YAG laser. This was predicted by a model accounting for up conversion and the dynamic equilibrium between the upper levels in thulium and holmium in Tm:Ho:YAG View full abstract»

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  • High-power and high-efficiency operation of a CW-diode-side-pumped Nd:YAG rod laser

    Publication Year: 1997 , Page(s): 40 - 44
    Cited by:  Papers (16)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (140 KB)  

    We have demonstrated high-power and high efficiency performance of a continuous-wave (CW) Nd:YAG laser with a simple and scalable side-pumping configuration. The maximum output power of 147 W was obtained in low brightness operation of M2=45. The corresponding electric efficiency is 14.8%. To our knowledge, this is the highest value reported for diode side-pumped Nd:YAG lasers. By using a rate and photon transport calculation, we have estimated the pumping efficiency of 72%. High brightness operation was also carried out by applying bifocusing compensation of the Nd:YAG rod. The brightness of 272 MW/cm2 sr with beam quality of M2=5.9 and output power of 107 W was obtained at the electric efficiency of 11.6%. The brightness and the electric efficiency are comparable with those of industrial high-power CO2 lasers that have been the first option for industrial applications View full abstract»

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  • Diode-pumped Nd:YLF master oscillator for the 30-kJ (UV), 60-beam OMEGA laser facility

    Publication Year: 1997 , Page(s): 59 - 63
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (112 KB)  

    The operational conditions of the OMEGA laser system require an extremely reliable and low-maintenance master oscillator. We have developed a diode-pumped, single-frequency, pulsed Nd:YLF laser for this application. The laser generates Q-switched pulses of ~160-ns duration and ~10-μJ energy content at the 1053-nm wavelength with low amplitude fluctuation, (<0.6% rms) and low temporal (build-up time) jitter (<7-ns rms). Amplitude and frequency feedback stabilization systems have been used for high long-term amplitude and frequency stability View full abstract»

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  • Diode array pumped kilowatt laser

    Publication Year: 1997 , Page(s): 53 - 58
    Cited by:  Papers (18)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (140 KB)  

    The diode array pumped kilowatt laser (DAPKL) has demonstrated more than an order of magnitude increase in brightness and average power for short pulse diode-pumped solid-state lasers since its inception in 1991. Significant advances in component technology have been demonstrated, including: development of a diffusion bonding process for producing large slabs of Nd:YAG laser material. Phase conjugation by stimulated Brillouin scattering (SBS) has been demonstrated with high reflectivity and fidelity in a simple focused geometry with input powers of 100 W. Pulse energies at 1.06 μm of 10 J have been demonstrated with a beam quality of 1.5 times diffraction limited at the 500-W level. An average power of 875 W at 100 Hz has been obtained. Efficient frequency doubling with a record power of 165 W has been demonstrated with 5 J per pulse at 0.53 μm. Work is ongoing to enclose the system in a compact brassboard with improved performance and long term stability View full abstract»

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  • Low-heat high-power scaling using InGaAs-diode-pumped Yb:YAG lasers

    Publication Year: 1997 , Page(s): 105 - 116
    Cited by:  Papers (68)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    We report to our knowledge the highest to date quasi-CW output power, 600 W and pulse energy, >1 J, for an InGaAs diode-pumped Yb:YAG laser. In separate preliminary results, we have also obtained 225 W of average output power under true CW diode pumping. This performance was obtained using a laser head designed to be part of a master oscillator power amplifier (MOPA) operating at 3 kW. We summarize why the diode-pumped Yb:YAG crystal laser is ideal for scaling to high average powers and the different approaches being pursued. We also report our latest results for side-pumped rod devices View full abstract»

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Aims & Scope

Papers published in the IEEE Journal of Selected Topics in Quantum Electronics fall within the broad field of science and technology of quantum electronics of a device, subsystem, or system-oriented nature.

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Editor-in-Chief
Luke F. Lester
Virginia Polytechnic Institute & State University